The Siemens 3RU2116-0CC0 is a SIRIUS thermal overload relay in frame size S00, designed to protect motor circuits against overcurrent and phase failure. Trip Class 10 means it will trip within 10 seconds at a locked-rotor current of 7.2× the setting range — fast enough for standard induction motor starts without nuisance tripping on normal acceleration. Rated insulation voltage is 690 V, and the relay handles switching currents from 2 A at 24 V up to 3 A at 120 V and 1 A at 400 V, covering control-circuit isolation for contactor coils and signal lamps across common panel voltages. Mounts directly to a contactor via the integrated fastening method — no separate base required, which saves DIN-rail space in a crowded enclosure. The spring-loaded terminals accept 2 × (0.5 to 2.5 mm²) solid or stranded wire, and the screwdriver tip needed is 3.0 × 0.5 mm.
Lifecycle and Sourcing
The integrated auxiliary switch provides a separate signal contact for remote tripped indication — the "for message 'Tripped'" note on the line refers to this built-in N/C or N/O contact that changes state when the relay operates.
Integration Notes
Dimensions are 45 mm wide × 87 mm high × 70 mm deep — fits the standard S00 footprint. Mounting position is any orientation, which simplifies panel layout when space is tight. Temperature compensation is active from -40 to +60 °C, so the trip curve stays accurate across the operating range without manual adjustment. The relay itself operates from -40 to +70 °C ambient. Power dissipation per pole is 1.6 W at rated current — factor that into enclosure thermal calculations if multiple relays are ganged.
Compliance and Documentation
Substance prohibitance date is 10/01/2009, aligning with RoHS compliance. The MTTF with high demand rate is 2,280 years, reflecting the thermal-mechanical design's reliability in continuous-duty applications. Rated frequency is 50 to 60 Hz, covering global mains supplies. The thermal overload release design is bimetallic, ambient-compensated, and requires no external power for trip operation.